Win: check for which mode the executeable was built

Ok, in the past I used some more sophisticated tools to check the signature of the executables for Windows, but ..
Fire up notepad.exe; load the exe which shall be checked; search for “PE”.
If the visible characters depict a d(agger) and cross (“d†”), then x64 (more correct: x86_64).
Else if a big L (“L”), then x86.